Is the rear bumper brace for a 68a caabriolet longer than one for a standard coupe? On the one I have now the distance from the center of the hole where the brace attaches top teh rear cross member to the center of the hole where the riser attaches to the floor cross sill rear assembly is 16.5". This makes a difference in the positioning of the floor cross sill rear asembly. There are no predrilled holes and the original wood is gone. I have attached a photo. I hope it works.